三氧化二钛异质界面超导体中的独特量子金属态
Unique quantum metallic state in the titanium sesquioxide heterointerface superconductor
AI总结：
本文在Ti$_2$O$_3$/GaN异质界面超导体中发现一种独特量子金属态，证明正常相中存在由电子库珀对形成的复合玻色子，为异质界面超导的配对本质提供新证据。
摘要：
在多种二维超导体中，以零温极限下饱和有限电阻为标志的量子金属态的出现，为异质结构超导领域注入了令人振奋的动力。尽管过去几十年进行了大量研究，人们对这种意外量子金属的本质仍未形成普遍共识。在此，我们报告了在三氧化二钛异质界面超导体Ti$_2$O$_3$/GaN中观察到的一种具有Bose金属标志性特征的独特量子金属态。值得注意的是，在二维超导-金属转变附近由磁场连续调控的量子玻色金属态持续存在于正常相中，表明即使在正常相中也存在由电子库珀对形成的复合玻色子。我们的发现为异质界面超导体正常相中的电子配对提供了明确证据，并为异质界面超导背后的配对本质提供了新的见解。
英文摘要：
The emergence of quantum metallic state marked by a saturating finite electrical resistance in the zero-temperature limit in a variety of two-dimensional superconductors injects an exciting momentum to the realm of heterostructure superconductivity. Despite much research efforts over last few decades, there is not yet a general consensus on the nature of this unexpected quantum metal. Here, we report the observation of a unique quantum metallic state within the hallmark of Bose-metal in the titanium sesquioxide heterointerface superconductor Ti$_2$O$_3$/GaN. Remarkably, the quantum bosonic metallic state continuously tuned by a magnetic field in the vicinity of the two-dimensional superconductivity-metal transition persists in the normal phase, indicating the existence of composite bosons formed by electron Cooper pairs even in the normal phase. Our findings provide a distinct evidence for electron pairing in the normal phase of heterointerface superconductors, and shed fresh light on the pairing nature underlying heterointerface superconductivity.
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